Portable telephone



FIG. 1 is a front, top and left side perspective view of a portable telephone showing our new design;

FIG. 2 is an elevational right side view thereof;

FIG. 3 is an elevational rear view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a "portable telephone," as shown and described. 